Sexual sterilization of insects with nsubstituted ureido phosphine oxides



United States Patent SEXUAL STERILIZATIUN 0F INSECTS WITH N- SUBSTITUTED URElDO PHOSPHDIE OXIDES Rudi F. W. Ratz, Hamden, and Miriam J. Gruber, New Haven, Conn, assignors to Olin Mathieson Chemical Corporation, New Haven, Conn., a corporation of Virginia 0 Drawing. Original application Mar. 19, 1963, Ser. No. 266,224. Divided and this application June 30, 1964, Ser. No. 387,258

13 Claims. (Cl. 167-13) preparation of these The primary object of this invention is series of N-substituted ure1do phosphine oxides wherein each oxide contains nected directly to a phosphorus atom.

Another object of this invention is to provide an eflicient process for the preparation of the aforementioned derivatives.

Still another in which R is selected from the class consisting of an aryl group and a substituted aryl group, and wherein X is selected from the class consisting of hydrogen, a lower alkyl group and a phenyl group, and wherein R R R and R are independently selected from the class consisting of a hydrogen atom, an alkyl group, e.g., methyl, ethyl, propyl, and butyl, and an aryl group such as a phenyl group.

An eflicient process for the preparation of the com pounds having the Formula I is herein provided, and these The compounds having the Formula I are prepared by the reaction of N-substituted ureido phosphoryl dichlo- 3,314,848 Patented Apr. 18, 1967 rides with ethylenimine and its homologs in accordance with the following reaction:

R, X: R1: R2! R31 previously defined.

A large number of N-substituted ureido chlorides can be used in the practice of this general, compounds having the formula:

and R in the above equation are 'as phosphoryl diinvention. In

II 01 O 0 dichloroaniline, 3,5-dibromoaniline, 2,3,4-trichloroaniline, 2,3,4-tribromoaniline, 2,3,5-trichloroaniline, 2,3,5-tribromoaniline, 2,3,5-triiodoaniline, 2,3,6-trichloroaniline, 2,3,- 6-triiodoaniline, 2,4,5-trichloroaniline, 2,4,5-tribromoaniline, 2,4,5-triiodoaniline, 2,4,6-trichloroaniline, 2,4,6-tribromoaniline, 2,4,6-triiodoaniline, 3,4,5-trichloroaniline, 3,4,5-tri-brornoaniline, 3,4,5-triiodoaniline, 2,3,4,5-tetrachloroaniline, 2,3,4,5-tetrabromoanilinc, 2,3,4,6-tetrachloroaniline, 2,3,4,6-tetrabromoaniline, 2,3,4,6-tetraiodoaniline 2,3,5,6-tetrachloroaniline, 2,3,5,6-tetrabromoaniline, 2,3,4,5,6apentachloroaniline, and 2,3,4,5,6-pentabromoaniline.

group or phenyl. Some of these haloanilines include: 2-chloro-N-methylaniline, 3-chl-oro-N-methylaniline, 4-chloro-N-methylaniline, 2,4 dichloro N methylaniline, 2,4,6-trichloro-N- methylaniline, 2 bromo N-methylaniline, 4-bromo-N- the reaction procedure. Similarly,

methylaniline, 2,4-dibromo-N-methylaniline, and 2,4,6-tribromo-N-methylaniline. Similarly, the same N-ethyl or N-phenyl derivatives may be used, e.g. Z-chloro-N-ethylaniline, 3-chloro-N-phenylaniline, and 4-bromo-N-ethylaniline.

Likewise compounds of the Formula I wherein R is a nitrated phenyl group can be prepared by the use of intermediates made by the reaction of isocyanato phosphoryl dichloride with various nitrated anilines. Some of these nitrated anilines includes: 2,4-dini-troaniline, 2,4-dinitromethylaniline, 2,4-dinitrodiphenylamine, 2,4,2',4-tetranitrodiphenylamine, 2,5-dinitroaniline, 2,6-dinitroaniline, 3,5-dinitroaniline, 2,4,6-trinitroaniline, 2,4,6-trinitromethylaniline, 2,4,6-t-rinitrodipheynlamine, 2,4,6,2,4,6'-hexa nitrodiphenylamine, 2,3,4,6-tetranitroaniline, pentanitroaniline, 3-nitro-2-aminotoluene, 5-nitro-2-aminotol-uene, 4-nitro-2-aminotoluene, 2-nitro-4-a-minotoluene, 6-nitro-3- aminotoluene, 3 nitro 4 :aminotoluene, 2,6-dinitro-4- aminotoluene, 4,6 dinitro 2 aminotoluene, 5-nitro-4- amino xylene, 3 nitro-4-amino-o-xy1ene, 6-nitro-4- amino m xylene, -n1tro-4-aminom-xylene, 4-nitro-2- amino-m-xylene, 5-nitro-2-amino-p-xylene, p-nitrosoaniline, and p-nitrosomethylaniline.

Various amines containing a naphthyl group and substituted naphthyl groups may also be reacted with isocyanato phosphoryl dichloride to provide intermediates which may be used in this invention. Typical of such amines are: l-naphthylamine, Z-naphthylamine, l-methylaminonaphthalene, N-phenyl-ot-naphthylamine, N-o-to'lyl-oc-naphthylamine, N-p-tolyl-a-naphthylamine, 2-phenylaminonaphthalene, 4-chloro-I-naphthylamine, 2,4-dichloro-l naphthylamine, 2-chloro-l-na-phthylamine, 1,4-dichloro-2-naphthylamine, 1,6-dibromo-2-naphthylamine, 3-bromo-1-chloro-Z-naphthylamine, 6-chloro-2-naphthylamine, 6-iodo-2- naphthylamine, 7-chloro-Z-n-aphthylamine, 7 bromo-2- naphthylamine, 7-iod0-2-naphthylamine, 5-nitro-1-naphthylamine, S-nitro-l-naphthylamine, 2-nitro-1-naphthylamine, 4-nitro-l-naphthyltamine, 2,4-dinitro-1-naphthylamine, 3-nitro-1-naphthylamine, 6-nitro-l-naphthylamine, 7 -nitro-1-naphthyla-mine, 5-nitro-2-naphthylamine, 8-nit-ro- 2-naphthylamine, 1-nitro-2-naphthylamine, 1,8-dinitro-2- naphthylamine, 3-nitro-2-naphthylamine, 4-nitro-2-naphthylamine, 1,6-dinitro-2-naphthylamine, and 1,6,8-trinitro- Z-naphthylamine.

N-substi-tuted ureido phosphoryl dichlorides useful in the practice of this invention can also be prepared by the reaction of isocyanato phosphoryl dichloride with aromatic [amines of the following nature: l-amino-anthracene, 2- amino-anthracene, 9-amino-anthracene, p-aminobenzenesulfonamide, and p-aminobenzenesulfanilide.

The preferred ethylenimines which are suitable for use in this invention are ethylenimine and Z-methyl-ethylenimine. However, 2,2-dimethyl-ethylenimine, Z-phenylethylenimine, 2,3-dimethylethylenimine, 2,3-diphenyl-ethylenimine, 2,2,3-triethyl-ethylenimine, and 2,2-diethyl-3- n-propyl-ethylenimine can also be used in the preparation of the compounds included in the general Formula I.

The reaction of N-substituted ureido phosphoryl dichlorides with the aforementioned ethylenimines is performed in the presence of an inert solvent or diluent. It has been found that many of the preparations proceed very readily in an organic solvent, and many of the desired aziridinyl derivatives can be thus prepared and isolated in good purity. For instance, bis(l-aziridinyl)-2-nitrophenylureido phosphine oxide and bis(1-aziridinyl)-3 ,4-dichlorophenylureido have been prepared in excellent yield in the presence of an organic solvent (i.e., Example 9 herein). Example 13 is also illustrative of this procedure. However, the use of anhydrous organic solvents or diluents does not appear to be entirely satisfactory in the preparation of several of the [aziridinyl derivatives. Example 14 of this specification illustrates that bis(1-aziridinyl)-4-cyanophenylu-reido phosphine oxide could only be obtained in crude form when a chloroform diluent was utilized in attempts to prepare bis- (l-aziridinyl)-4-nitrophenylureido phosphine oxide in an anhydrous medium were accompanied by numerous process difficulties. It was impossible to obtain even a reasonably pure compound, and it could only be obtained as a smeary residue. Therefore, although many of the novel aziridinyl derivatives of this invention can be prepared while using organic solvents or diluents in the process, there are occasions where the use of these solvents presents difficulties with respect to purity of the desired product.

However, it has been found that the N-substituted ureido phosphoryl chlorides can be readily reacted with the ethylenimines in aqueous media, and the use of this procedure is the preferred process embodiment of this invention. This was somewhat unexpected since it had been assumed that the starting dichlorides would be hydrolyzed as a result of this procedure. However, the aziridinyl derivatives can be obtained in high yield and excellent purity with a minimum of process difficulties by utilizing an aqueous media in the reaction process. In general, the resulting aziridinyl derivatives are sparingly soluble in Water and can be easily filtered from the reaction mixture at the conclusion of the reaction. This occurred despite the fact that the nature of the aziridinyl derivatives is weakly acidic, and. it could be assumed that they would be fairly soluble in the alkaline reaction medium. However, this does not occur, and the aziridinyl derivatives invariably separated from the aqueous reaction medium in the form of finely dispersed particles which may be easily separated and purified.

The preparation of the compounds of this invention, Whether performed in non-aqueous media or in aqueous media, should be performed at reaction temperatures of below about 30 C. The reactions can be carried out in aqueous media at temperatures of from about -10 C. to about 30 C., but the preferred temperature range at which the compounds can be prepared in aqueous media is from about -5 C. to about 15 C.

An acid acceptor should be used in the process of this invention. If desired, a molar excess of the ethylenimine involved may be used during the reaction, in which event the excess will serve as an acid acceptor and take up the by-product, hydrochloric acid. However, the preferred method is to eliminate the use of costly excess ethylenimine by the use of another acid acceptor. In this manner only the theoretical amount of the ethylenimine need be employed in the process. When the preparation involves the use of an organic solvent or diluent, suitable acid acceptors which may be utilized are ammonia, tertiary amines such triethylamine, and other compounds including pyridine, N-ethyl morpholine and dimethylacetamide, etc. When the preparations are performed in aqueous media, alkali metal or alkaline earth hydroxides can be used as acid acceptors.

The following examples describe the preparation of several of the N-substituted ureido bis(1-aziridinyl) phosphine oxides of this invention. These examples are illustrative only, and they are not to be construed as limiting the scope of this invention since many variations are possible.

Example 1 Isocyanato phosphoryl dichloride was prepared in accordance with the procedure of Kirsanov et al. (J. Gen. Chem. U.S.S.R., 31, 1496 (1961), English trans).

A two liter round bottom flask was equipped with a mechanical stirrer, dropping funnel, thermometer and a condenser connected from the top to a trap containing dichloroethane. Into the flask was placed 832.0 g. (4.0 mole) of phosphorus pentachloride and 240 ml. of dichloroethane. The reaction mixture was warmed by immersion of the flask in a mineral oil bath heated to C. In the dropping funnel was placed 356.0 g. (4.0 mole) of ethyl carbamate which was melted and kept in a molten state by means of a stream of hot air. The ethyl carbarn'ate was added dropwise to the reaction flask at such a rate that the reaction temperature was maintained between 75 to 78 C. The mineral oil bath was held between 95 -109 C. during the addition period. When the addition of the carbam'ate was completed, a clear yellow solution had been obtained and gas evolution had slowed considerably. The dichloroethane from the trap was then added to the reaction mixture. The solvent was removed by distillation at reduced pressure, and then 424.2 g. of a colorless liquid was obtained, B.P. 50-51 C./22 mm., n 1.4757. This material is isocyanato phosphoryl dichloride. Yield: 66.3%. n 1.470 had been reported previously in (Kirsanov et al., ibid., 24, 1031 (1954), English trans).

Example 2 A solution of 16.0 g. (0.10 mole) of isocyanato phosphoryl dichloride in 100 ml. of anhydrous ethyl ether was placed in a 600 ml. round bottom three-necked reaction flask equipped with a mechanical stirrer, dropping funnel and a reflux condenser, the latter connected with a calcium chloride filled drying tube. The solution was cooled with an ice bath to about 0 to 15 C., 'and a solution of 12.0 g. (0.102 mole) of p-aminobenzonitrile in 140 m1. of ethyl ether was added dropwise with stirring over a one hour period. A fine white solid separated immediately from the reaction mixture. Stirring was continued at 0 to 15 C. for 15 minutes and finally for 30 minutes at room temperature. The mixture was then allowed to stand for 30 minutes before it was filtered. The filtered product was dried and there was obtained 26.8 g. of a pale lavender powder which melted with decomposition at 163 C. The following analytical data revealed that N-4-cyanophenylureido phosphoryl dichloride had been obtained. Yield: 96.4%.

Analysis.-Calcd. for C H Cl N O P: N, 15.11; P, 11.14. Found: N, 14.84; P, 11.25.

A solution of 0.143 (0.0036 mole) of sodium hydroxide and 0.1517 g. (0.0036 mole) of ethylenimine in 2 ml. of distilled water was placed in a 50 ml. bottle with a screw cap closure. The solution was cooled to 10 C., and 0.4980 g. (0.0018 mole) of N-4-cyanophenylureido phosphoryl dichloride was added in three portions. After standing for 1% hours the reaction mixture which was then a slightly tan paste was filtered using a Biichner funnel. After drying, there was obtained 0.30 g. of a powdery material having a melting point of 197 to 198 C. The melting point determination was carried out on the preheated plate of a Fisher-Johns apparatus. The lowest temperature at which clear melting occurred upon slight pressure was recorded as the melting point. This procedure was also applied in all other examples of this invention. Melting was followed by polymerization. The following analytical data revealed that bis( 1-aziri'dinyl)-4- cyanophenylureido phosphine oxide had been obtained. Yield: 57.9%.

Analysis.-Calcd. for C H N O P: C, 49.49; H, 4.85; N, 24.05; P, 10.63. Found: c, 48.23; H, 5.28; N, 23.61; P, 10.59. 3

Example 3 Isocyanato phosphoryl dichloride was reacted with pchloroaniline in the same manner as shown in Example 2, and N-4 chlorophenylureido phosphoryl dichloride was obtained in 65.5% yield. It is a white solid which melts at 159 -161 C. on a preheated melting point block.

A solution of 1.60 g. (0.04 mole) of sodium hydroxide and 1.72 g. (0.04 mole) of ethylenimine in ml. of distilled water was placed in a 50 ml. bottle with a screw cap closure. The solution was cooled to 8 C. by means of a Dry Ice-acetone bath, and 5.750 g. (0.02 mole) of N-4-chlorophenylure1do phosphoryl dichloride was added The mixture was allowed to stand for one hour, and at this point a fine, crystalline powder had separated. The product was filtered and washed with two 10 ml. portions of water. Tests for ionic chlorine were negative. The material was recrystallized from dimethylformamide to give small, colorless needles having a melting point of 211 C. on a preheated plate. Melting was followed by polymerization. The following analytical data revealed that bis(1-az1'ridinyl) 4 chlorophenylureido phosphine oxide had been obtained. Yield: 45.0%.

Analysis.-Calcd. for CI1H14N4OQPCIZ C, H, 4.69; N, 18.63; P, 10.30; Cl, 11.79. Found: C, 43.90; H, 4.88; N, 18.75; P, 10.68; Cl, 11.80.

Example 4 Isocyanato phosphoryl dichloride was reacted with 3,4- dichloroaniline in the same manner as shown in Example 2, and N-3,4-dichlorophenylureido phosphoryl dichloride was obtained in 97.2% yield. It is a white solid having a melting point of 161-168 C. accompanied by decomposition.

50 ml. bottle with a screw cap The solution was cooled to 7 C. by means of an ice-salt mixture, and 6.1 g. (0.0189 mole) of N-3,4-

perature of the reaction mixture was kept between 5 C. and 0 C. After addition was completed, the reaction mixture was allowed to stand at room temperature for one hour. had separated from solution, and this material was collected by suction filtration. There was obtained 2.7 g. of a colorless, free-flowing crystalline powder having a melting point of l92 C. accompanied by polymerization. The following analytical data revealed that bis(l-aziridinyl)3,4-dich1orophenylureido phosphine oxide had been obtained. Yield: 42.5%.

Analysis.Calcd. for CHHBCIQNQOZPI C, H, 3.88; N, 16.72; P, 9.25. Found: C, 38.56; H,'4.74; N,

Example 5 Isocyanato phosphoryl o-chloroaniline in the same 2, and N- 2-chlorophenylureiclo cap closure. The solution was cooled to -10 C. by means of a Dry Ice-acetone bath, and 5.75 .g. (0.02 mole) of N-2-chlorophenylureido lowing analytical data revealed that bis(1-aziridinyl)-2- been obtai d. Yield: 41.6%. ne

Analysis.-Calcd. for C H ClN O P: C, 43.94; H, 4.69; N, 18.63; P, 10.30, Cl, 11.79. Found: C, 43.82; H, 5.10; N, 18.92; P, 10.66; Cl, 11.80.

Example 6 Isocyanato phosphoryl dichloride was reacted with 2,5- dichloroaniline in the same manner as shown in Example 2, and N-2,5-dichlorophenylureido phosphoryl dichloride '2 was obtained in 64.9% yield. It is a white solid having a melting point of 157 to 158 C.

A solution of 2.4 g. (0.06 mole) of sodium hydroxide and 2.58 g. (0.06 mole) of ethylenimine in 20 ml. of distilled water was placed in a 50 ml. bottle with a screw cap closure. The solution was cooled to 10 C., and 9.66 g. (0.03 mole) of N-2,5--dichlorophe'nylureido phosphoryl dichloride was added in five equal portions with shaking. The reaction mixture was maintained below -7 C. during this period. After addition was completed, the reaction mixture was allowed to come to room temperature with frequent shaking, and was then recooled to -10 C. and filtered through a Biichner funnel. The solid material was washed with a 10 ml. portion of water, and 6.7 g. of a white solid was thus obtained. This material was recrystallized from dimethylformamide to give a crystalline material having a melting point of 171- 172 C. Melting, was followed by polymerization. The following analytical data revealed that bis(l-aziridinyl)- 2,5-dichlorophenylureido phosphine oxide had been obtained. Yield: 66.7%.

Analysis..-Calcd. for C H Cl N O P: C, 39.40; H, 3.88; N, 16.72; P, 9.25. Found: C, 39.23; H, 3.89; N, 16.77; P, 8.90.

Example 7 Isocyanato phosphoryl dichloride was reacted with 2,4,6-trichloroaniline in the same manner as shown in Example 2, and N-2,4,6-trichlorophenylureido phosphoryl dichloride was obtained in 84.4% yield. It is a white solid having a melting point of 157160 C.

A solution of 0.8 g. (0.02 mole) of sodium hydroxide and 0.903 g. (0.021 mole) of ethylenimine in 10 ml. of water was placed in a 50 ml. bottle with a screw cap closure. The solution was cooled to -10 C., and 3.565 g. (0.01 mole) of N-2,4,6-trichlorophenylureido phosphoryl dichloride was added to the bottle in several small portions with stirring and shaking. During the addition period, the temperature was maintained below 4 C. After addition was complete, the mixture was kept below -4 C. for an additional 45 minutes and finally was kept at room temperature for 1 /2 hours longer. The mixture was then filtered through a Biichner funnel and 1.0 g. of a white solid material was obtained which was washed once with a small portion of water. It was again filtered and dried to give 0.5 g. which melted at 202 C. on a. preheated plate followed by immediate polymerization. The following analytical data revealed that the desired bis(l-aziridinyl)-2,4,6-trichlorophenylureido phosphine oxide had been obtained. Yield: 13.5%.

Analysis.-Calcd. for C l-I Cl N O P: N, 15.17; P, 8.39. Found: N, 14.43; P, 7.77.

Example 8 Isocyanato phosphoryl dichloride was reacted with 4- chlor-2-nitroaniline in the same manner as shown in Example 2, and N-4-chloro-2-nitrophenylureido phosphoryl dichloride was obtained in 63% yield. It is a pale yellow solid having a melting point of 152 to 156 C.

. A solution of 1.26 g. (0.0315 mole) of sodium hydroxide and 1.3524 g. (0.0315 mole) of ethylenimine in 20 ml. of water was placed in a 50 ml. bottle with a screw cap closure and cooled to about C. by means of an ice-salt mixture. Then 4.98 g. (0.0157 mole) of N-4- chloro-2-nitrophenylureido phosphoryl dichloride was added to the bottle in small portions with frequent shaking. A thick yellow paste resulted which was well shaken and allowed to stand at about 5 C. for 15 minutes. The mixture was filtered through a Biichner funnel. The filtered solid was washed with two 50 ml. portions of water, rinsed with acetone and dried. This solid was recrystallized from dimethylformamide to give a yellow crystalline powder having a melting point of 187 to 188 C. The following analytical data revealed that 8 bis( l-aziridinyl) -4-chloro-2-nitrophenylureido phosphine oxide had been obtained. Yield: 83.3%.

AnaIysis.-Calcd. for C H ClN O P: C, 38.22; H, 3.79; P, 8.96. Found: c, 38.35; H, 4.72; P, 8.49.

Example 9 Isocyanato phosphoryl dichloride was reacted with o-nitroaniline in the same manner as shown in Example 2, and N-Z-nitrQphenyl-ureidophosphoryl dichloride was obtained in 78.2% yield. It is a pale yellow solid having a melting point of 143-145 C.

A 500 ml. round bottom three-necked reaction flask was equipped with a mechanical stirrer, dropping funnel, and a. reflux condenser connected with a calcium chloride filled drying tube. Into the flask was placed 6.0 g. (0.020 mole) of N-2-nitrophenylureido phosphoryl dichloride and ml. of anhydrous ethyl ether. Between 0 and 10 C. a solution of 2.0 g. (0.0465 mole) of ethylenimine and 4.20 g. (0.0416 mole) of triethylamine in 53 ml. of ethyl ether was added dropwise with stirring over a period of 45 minutes. The reaction mixture was then allowed to stand overnight. The mixture was filtered, and the yellow solid on the filter plate was rinsed with ether, washed with 50 ml. of distilled water, :and finally again with ether. After drying over phosphorus pentoxide, there was obtained a yellow crystalline solid which melted at 156.5 C. on a preheated block. The following analytical data revealed that bis(l-aziridinyl)-2-nitrophenylureido phosphine oxide had been obtained. Yield: 82.3%.

AnaIysis.-C=alcd. for C H N O P: C, 42.44; H, 4.50; N, 22.51. Found: C, 42.44; H, 5.18; N, 22.22.

Example 10 Isocyanato phosphoryl dichloride was reacted with p-nitroaniline in the same manner as shown in Example 2, and N-4-nitrophenylureido phosphoryl dichloride was obtained in 80.5% yield. It is a. pale yellow solid which melts at 161 C. on a preheated plate accompanied by decomposition.

A solution of 1.6044 g. (0.0401 mole) of sodium hydroxide and 1.8165 g. (0.0422 mole) of ethylenimine in 15 ml. of distilled water was placed in a 50 ml. bottle with a screw cap closure and cooled to 11 C. Then 5.9614 g. (0.020 mole) of N-4-nitropheny lureido phosplhoryl dichloride was added in small portions with stirring while the reaction temperature was maintained below 5 C. The mixture was shaken thoroughly and kept at approximately -5 C. for an additional 30 minutes and finally was kept at room temperature for 45 minutes. After filtration, a fine yellow powder was obtained which was washed once with water. Tests for ionic chlorine at this point were negative. After drying, a fine yellow crystalline material was obtained which melted at 199-201 C., followed by polymerization. The following analytical data revealed that bis(l-aziridinyl)-4-nitrophenylureido phosphine oxide had been obtained. Yield: 69.4%.

Analysis.-Calcd. for C H N O P: C, 42.45; H, 4.53; N, 22.50; P, 9.95. Found: C, 41.08; H, 4.67; N, 20.96; P, 9.95.

Example 11 Isocyanato phosphoryl dichloride was reacted with aniline in the same manner as shown in Example 2, and N-phenylureido phosphoryl dichloride was obtained in 96.4% yield. It is a white finely-divided crystalline material having a melting point of 122-123 C.

A solution of 0.68 g. (0.017 mole) of sodium hydroxide and 0.73 g. (0.017 mole) of ethylenimine in 10 m1. of distilled water was placed in a 50 ml. bottle with a screw cap closure and cooled to -5 C. by means of an ice-salt mixture. Then 2.1 g. (0.0083 mole) of N-phenylureido phosphoryl dichloride was added in small portions to the solution. The mixture was well shaken and maintained at 5 C., and a white product quickly precipitated. This solid material was filtered and dried. On a preheated block a melting point of 184 C. was determined. Melting was accompanied with polymerization. The following analytical data revealed that bis(1-aziridinyl)phenylureido phosphine oxide had been obtained. Yield: 45.5%.

Analysis.Calcd. for C H 'N O P: C, 49.62; H, 5.68; N, 21.05; P, 11.63. Found: C, 49.28; H, 6.76; N, 20.1; P, 11.46.

Example 12 Isocyanato phosphoryl dichloride was reacted with l-napthylamine in the same manner as shown in Example 2, and N-l-napthylureido phosphoryl dichloride was obtained in 88.5% yield. It is a white powder which melts at 122.5-125 C.

A solution of 1.6014 g. (0.04 mole) of sodium hydroxide and 1.7913 g (0.0417 mole) of ethylenimine in 10 ml. of distilled water was placed in 50 ml. bottle with a screw cap closure and cooled to -4 C. by a Dry-Ice-acetone mixture. Then 6.061 g. (0.02 mole) of N-l-napthylureido phosphoryl dichloride was added to the bottle in small portions with stirring while the reaction temperature was maintained below 5 C. When addition was completed, a solid product had formed which was allowed to stand for a short period before it was broken into smaller particles by grinding. This material was filtered, washed lytical data obtamed on the crude product revealed that the desired bis(l-aziridinyl)-1-napthylureido phosphine oxide had been obtained.

Analysis.Calcd. for C15H17N402P: N, P, Found: N, 16.67; P, .48.

Example 13 A 500 ml. round bottom three-necked reaction flask Was equipped with a mechanical stirrer, dropping funnel and a reflux condenser connected with a calcium chloride filled drying table. Into the flast was placed 4.3 g. (0.014 mole) of N-2-nitrophenylureido phosphoryl dichloride and 80 ml. of anhydrous ethyl ether. Between C., a solution of 2.0 g. (0.035 mole) of promole) of triethylamine in Example 14 Into the reaction flask was placed a slurry of 10.2 g. (0.04 mole) of N-4-cyanophenylureido phosphoryl dichloride in 140 ml. of chloroform. Into the dropping funnel was placed a solution of 3.4 g. (0.08 mole) of ethylenimine and 8.1 g. (0.08 mole) of triethylamine in 90 ml. of chloroform. The reaction flask was cooled by immersion in an ice water bath to about 2 C., and the solution in the dropping funnel was added to the reaction flask with stirring over a one hour period. During this period vapors gathered in the reaction flask and the color of the reaction mixture changed from a pale lavender to a light orange color. Stirring was continued for an addition /2 hour and then the reaction mixture was allowed to stand for two hours. The solvent was evaporated in turated with diethyl After drying, awhile solid was obtained which melted at 79-81 C. with decomposition followed by polymerization. The following analytical data revealed that crude bis(I-aziridinyl)-4-cyanophenylureido phosphine oxide had been obtained.

Analysis.Calcd. N, 24.05; P, 10.63. P, 8.48.

As mentioned in the preceding discussion, it has been found that the organic phosphorus compounds having the general Formula I are characterized by a high degree of biological activity, and they are particularly elfective as chemosterilants in the controlling of harmful insects. Although the compounds of this invention can be used alone as chemosterilants, it is more practical to utilize them in a dispersed form admixed with a major amount of suitable carrier or extending agent. A variety of pest sterilant compositions can 'be prepared containing these compounds as the principal active ingredient.

The term dispersed as used herein is used in a broad sense. When it is said that the phosphine oxides having the Formula I are dispersed, it means that the particles may be molecular in siZe and held in true solution in a suitable solvent. It means further that the particle may be colloidal in size and dispersed through a liquid phase in the form of suspension or emulsions or in the form of particles held in suspension by wetting agents. The compounds may also be dispersed and admixed in solid carriers so as to form powders, dusts or granular preparations.

The term extending agent as used in this specification and claims includes any and all of those carriers or diluents in which the compounds of this invention are dispersed. For example, it includes the solvents of a true solution, the liquid phase of suspensions and emulsions and the solid carriers of a powder or dust.

The phosphine oxides of the general Formula I may be combined with a large number of diluents to give sterilant be applied to harmful insests form of food.

For example, the phosphine oxides of this invention can be formulated with various carriers to form baits which when fed to harmful insects prove to be excellent pest sterilant compositions. The following procedure will serve to illustrate how the compounds of this invention can be formulated into baits suitable for sterilizing insects.

A solution of 0.5 g. of bis(l-aziridinyl)-3 ,4-dichlorophenyl ureido phosphine oxide in 50 ml. of chloroform was prepaied. This solution was blended with 100 g. of granulated sucrose, and after a thorough mixing of the solution with the sucrose, the solvent was evaporated. The residual solid material was ground in a mortar. This bait was fed to twenty-four hour old houseflies for a for C12H14N5O2PZ C, H, Found: C, 49.49; H, 6.12; N, 17.92;

period of five days. On the succeeding two days, eggs were collected from a prepared oviposition site and incubated for 24 hours at 75 F. These eggs were then inspected under a binocular microscope for hatching. All unhatched eggs are considered non-viable or sterile, and the data were recorded as percent sterile eggs. Under the conditions of this procedure 99% of the eggs were non-viable. It has been found that a good sterilant should cause about sterility at 0.5% concentration, and this value is generally exceeded by compounds of this invention. In fact, it is an important feature of this: invention that the chemosterilants described herein possess a high degree of effectiveness when used with carriers and diluents at concentrations of 0.01% by weight and even lower.

The following tabulated information illustrates the effectiveness of several other phosphine oxides of this invention when they were tested as sterilants in a similar manner.

Percent Active Percent Non- A number of other carriers may be employed as extending agents in baits in addition to the sugar carriers described above. Examples of other carriers include corn grits, limestone, pumice, corn cob grits of varying particle sizes, walnut shell aggregate, a mixture of powdered eggspowdered milk-sucrose, talc, Pyrax granules, concrete sand, etc. When the carrier is not sugar, it is adv-antageous to add about 5 to 50% by weight of sugar to the carrier as a lure.

The compounds of the Formula I can also be admixed with a major amount of various solid extending agents to provide pest sterilant formulations which can be applied as powders or dusts. Dry extenders suitable for such use include kaolin, calcium carbonate, talc, Bardens clay, Attapulgus clay and others. These pest sterilant compositions may be utilized in the dry form or, if so desired, -a wetting agent may be used to prepare Wettable powders.

The chemosterilants of this invention may also be used to combat harmful insects in the form of emulsions. These emulsions can be prepared by dissolving the active ingredient in a solvent which is not miscible with Water, and adding water to the solution in the presence of an emulsifying agent. Emulsion formulations of this nature can be readily sprayed in desired locations.

The chemosterilants described herein can also be dispersed in an inert carrier such as water to provide useful suspension formulations. Usually a surface active agent can be advantageously used in these formulations, but this is not a necessity. For example, bis(1-aziridinyl)-3,4- dichlorophenyl ureido phosphine oxide was ball milled with water to provide a very fine colloidal suspension containing 0.5% by weight of active ingredient. Thirty ml. of this suspension was sprayed on houseflies in a small cage. The flies were left in this cage for one hour before they were transferred to a larger cage and fed milk. Subsequently, eggs were collected from a prepared oviposition site and incubated for 24 hours at 75 F. These eggs were inspected under a microscope for hatching, and 99% of the eggs were found to be non-viable.

Of course, the N-substituted ureido bis(l-aziridinyl) phosphine oxides can also be dissolved in various solvents useful in the spraying of harmful insects. Suitable solvents include: acetone, chlorinated hydrocarbons such as chloroform, etc., dimethylacetamide, dirnethylformamide and others.

The chemosterilants described here may be used in the control of a wide variety of harmful insects including houseflies, lat rine flies, the screw worm fly, the stable fly, vinegar fly, the Mediterranean fruit fly, the Mexican fruit fly, the Oriental fruit fly, the bool weevil, eye gnats, and

others. They may also be used in sterilizing compositions applicable in the control of the malarial mosquito.

What is claimed is:

1. A method for the sterilization of insects which comprises contacting said insects with an amount sufficient to exert a sterilizing action of a compound having the where R is selected from the class consisting of phenyl, naphthyl, halogenated phenyl, nitrated phenyl, and cyanophenyl', and R is hydrogen or methyl.

2. The method of claim 1 wherein R is methyl.

3. The method of claim 2 wherein R is n'trated phenyl.

4. The method of claim 3 in which the compound is bis[l(2 methylaziridinyD] N-Z-nitrophenylureido phosphine oxide.

5. A method for the sterilization of insects which comprises contacting said insects With an amount sufficient to exert a sterilizing action of a compound having the formula /CH2 N l from the class consisting of phenyl,

phenyl, and cyanowhere R is selected naphthyl, halogenated phenyl, nitrated phenyl.

6. The method of calim 5 in Which the compound is bis( l-aziridinyl)-N-phenylureido phosphine oxide.

7. The method of claim 5 wherein R is nitrated phenyl.

8. The method of claim 7 in which the compound is bis(l-aziridinyl)-N-2-nitrophenylureido phosphine oxide.

9. The :method of claim 5 wherein R is halogenated phenyl.

10. The method of claim 9 in which the compound is bis(l aziridinyl) N-3,4-dichlorophenylureido phosphine oxide.

11. The method of claim 9 in which the compound is bis(1 aziridinyl) N-(4-chlorophcnyl) ureido phosphine oxide.

12. The method of claim 9 in which the compound is bistdl -aziridinyl) -N-(2-chlorophenyl) ureido phosphine 0x1 e.

13. The method of claim 9 in which the compound is bis(1 aziridinyl) N (2,5-dichlorophenyl) ureido phosphine oxide.

References Cited by the Examiner UNITED STATES PATENTS 3,201,313 8/1965 Bardos et al l67-78 FOREIGN PATENTS 610,695 5/1962 Belgium.

OTHER REFERENCES LEWIS GOTTS, Primary Examiner. RICHARD L. HUFF, Assistant Examiner. 

1. A METHOD FOR THE STERILIZATION OF INSECTS WHICH COMPRISES CONTACTING SAID INSECTS WITH AN AMOUNT SUFFICIENT TO EXERT A STERILIZING ACTION OF A COMPOUND HAVING THE FORMULA 